Re: a few MDB questions

[Quanah Gibson-Mount <quanah@zimbra.com>]

--On Monday, September 02, 2013 12:22 PM -0600 Brent Bice <bbice@sgi.com> 
wrote:

>     I'm trying out the mdb backend before converting several of our LDAP
> servers to it and have a few questions I haven't found answers to yet.


OpenLDAP version?

>     Firstly, I found when I spun up an instance using MDB that I couldn't
> have more than 1000 leaf nodes.  It appears when I tried to create the
> 1001st leaf node, one of the earlier nodes disappeared.  Is this a known
> limitation or just a config option I don't see in the slapd-mdb man page?
> Right now my config just contains:
>
> database	mdb
> masxize		2147483648
> suffix          "dc=mysuffix,dc=com"
> rootdn          "cn=Manager,dc=sgi,dc=com"
> rootpw		myrootpw
> directory       /data/ldap/instance-v1.4/var/openldap-data
> [... a bunch of indexes ...]
> checkpoint      1024000 60

This is not a valid back-mdb parameter.  I would suggest re-reading the man 
page.

>     The total size of the DB was only 412 megs so far and each of three
> branches in the DB appeared to be limited at 1000 leaf nodes so I don't
> think I was just hitting a maxsize limit.

I have DBs with hundreds of millions of objects, without issue.

>     Which leads me to the 2nd question... The maxsize option (according
> to what I've read) is the maximum size of the database in bytes.  But it
> looks to me like the biggest value I can specify is 4G - the biggest
> value for an unsigned long.  Would this be cuz the system I'm testing on
> is a 32bit version of linux?  (unsigned long is only 4 bytes whereas on a
> 64 bit OS unsigned longs are 8 bytes)

I would advise using a 64-bit OS with MDB.

--Quanah


--

Quanah Gibson-Mount
Lead Engineer
Zimbra, Inc
--------------------
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